'Scene Royal Institution': Gerrit Moll and John Dalton, c 1831-1840.
© Science Museum / Science & Society Picture Library
Coloured lithograph caricature of Gerrit Moll (left), and John Dalton (right). Gerard (or Gerrit) Moll (1785-1838), was a Dutch physicist and profesor at the University of Utrecht. Dalton (1766-1844) formulated the atomic theory to explain chemical reactions, based on the concept that atoms of different elements are distinguished by differences in their weights, a theory which has influenced scientific thought for over 150 years. Here Moll is being thanked by Dalton for an anonymous pamphlet in defence of English science published in 1831, soon after which Dalton was awarded a pension, announced at the annual meeting of the British Asociation for the Advancement of Science; the artist suggests these events are related.